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sounds like you have one units side channels set diffrent than the other.you should be able to reset this by reverseing the battries in both units for a few moments then replacing them correctly. or remove battries for 24 hours or more to delete memory

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To answer yr question is very simple..the radios you have are not able to operate in Australia as these units work on a frequency range (462MHz-464MHz), which in the USA are allocatted as license free. In Australia, you need a license to operate in this frequency band, as a commercial or government user. Sorry but, PRM/GMR radios are blocked in Australia.

It does not appear (based on the manufactuer's website) that the charging cradle for the Uniden GMR638 is compatible with any other radio models.

You may not be able to purchase another GMR638 if you only want a single radio to replace the one that was dropped. The current trend is for manufacturers to bundle consumer two-way radios in packs of two, three or four since most users do not purchase single radios.

If you definitely want to get the exact same model you might have to either purchase another two-pack or contact the manufacturer directly to see if they have single units available. Otherwise, any 22 channel FRS/GMRS combo radio should be able to communicate with your Uniden radios.

Hello daemon10,The current trend is for manufacturers to bundle consumer two-way radios in packs of two and four since most users do not purchase single radios.However, some models are available as single units and any 22 channel FRS/GMRS combo radio should be able to communicate with your Uniden radio.If you definitely want to get the exact same model you might have to either purchase another two-pack or contact the manufacturer directly to see if they have single units available

First,we call this transciever as SRRS (Short Range Radio Service), it can communicate within 500 meters open range or no obstruction,now if the unit can't communicate each other within the range ,i would suggest to sent it to uniden service center......

sounds like you have one units side channels set diffrent than the other.you should be able to reset this by reverseing the battries in both units for a few moments then replacing them correctly. or remove battries for 24 hours or more to delete memory